4A, 21V, 500kHz Synchronous Step-Down Converter


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The RT7264A is a synchronous step-down regulator with an internal power MOSFET. It achieves 4A of continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. An adjustable soft-start reduces the stress on the input source at startup.
The RT7264A requires a minimal number of readily available external components, providing a compact solution.


  • Distributive Power Systems
  • Battery Charger
  • DSL Modems
  • Pre-Regulator for Linear Regulators
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 21
Number of Outputs 1
Vout (min) (V) 0.808
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 4
Current Limit (typ) (A) 7.5
Freq (typ) (kHz) 500
Freq (min) (kHz) 300
Freq (max) (kHz) 2000
Ext Sync Yes
Ron_HS (typ) (mOhm) 120
Ron_LS (typ) (mOhm) 40
Iq (typ) (mA) 0.7
Features Adjustable Soft-Start;Current Mode Control;Enable Input;External Synchronization;Force PWM;Internal Compensation;OCP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
  • Wide Input Range : 4.5V to 21V
  • Adjustable Output from 0.808V to 15V
  • 4A Output Current
  • 120mΩ/40mΩ Internal Power MOSFET Switch
  • Internal Compensation Minimizes External Parts
  • 500kHz Fixed Switching Frequency
  • Synchronized External Clock from 300kHz to 2MHz
  • Adjustable Soft-Start
  • Cycle-by-Cycle Over Current Limit
  • Thermal Shutdown Protection
  • Available in SOP-8 (Exposed Pad) and WDFN-14L 4x3 Packages
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
4A, 21V, 500kHz Synchronous Step-Down Converter2012/04/09
Technical Documents
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Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2019/12/12
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How to estimate control loop bandwidth from the transient response time?2017/03/30 755
Reference Design
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Richtek Load Transient Tool2019/01/09
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7264AZQWWDFN4x3-141500 Not available Buy from Distributor
RT7264AZSPPSOP-82500 Not available Buy from Distributor